H based control of a DC/DC buck converter feeding a constant power load in uncertain DC microgrid system.

DC microgrids are gaining more and more popularity and are becoming a more viable alternative to AC microgrids (MGs) due to their advantages in terms of simpler power converter stages, flexible control algorithms and the absence of synchronization and reactive power. However, DC-MGs are prone to instability issues associated with the presence of nonlinear loads such as constant power loads (CPL) known by their incremental negative impedance (INI), which may lead to voltage collapse of the main DC Bus. In this paper, H-based controller of a source side buck converter is designed to avoid the instability issues caused by the load-side converter acting as a CPL.